From 082595feeba5544c28b5d968e53b1d8d954039d2 Mon Sep 17 00:00:00 2001
From: Tom Freudenberg <tom.freudenberg@4commerce.de>
Date: Sat, 1 Aug 2015 13:17:30 +0200
Subject: [PATCH] add: support EHLO command and reply with enabled extensions

---
 lib/midi-smtp-server.rb | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/midi-smtp-server.rb b/lib/midi-smtp-server.rb
index 422b70a..3d815a6 100644
--- a/lib/midi-smtp-server.rb
+++ b/lib/midi-smtp-server.rb
@@ -293,8 +293,16 @@ def process_line(line)
           Thread.current[:ctx][:server][:helo] = @cmd_data
           # set sequence state as RSET
           Thread.current[:cmd_sequence] = :CMD_RSET
-          # reply ok
-          return "250 OK"
+          # check whether to answer as HELO or EHLO
+          if line =~ /^EHLO/i
+            # reply supported extensions
+            return "250-8BITMIME\r\n" + 
+                   (@auth_mode != :AUTH_FORBIDDEN ? "250-AUTH LOGIN PLAIN\r\n" : "") +
+                   "250 OK"
+          else
+            # reply ok only
+            return "250 OK"
+          end
 
         when (/^AUTH(\s+)((LOGIN|PLAIN)(\s+[A-Z0-9=]+)?|CRAM-MD5)\s*$/i)
           # AUTH